fixing missing fake given

vector/src/test/java/im/vector/app/test/fakes/FakeVectorFeatures.kt

@@ -27,6 +27,10 @@ class FakeVectorFeatures : VectorFeatures by spyk<DefaultVectorFeatures>() {
         every { isOnboardingPersonalizeEnabled() } returns true
     }
 
+    fun givenCombinedRegisterEnabled() {
+        every { isOnboardingCombinedRegisterEnabled() } returns true
+    }
+
     fun givenCombinedLoginEnabled() {
         every { isOnboardingCombinedLoginEnabled() } returns true
     }